Perimeter of a triangle is 220 and length is 60 what is the breath and the area please show the work
Answers
Perimeter is the distance covered along the boundary forming a closed figure when you go around the figure once.
The amount of surface enclosed by a closed figure is called its area.
Figures in which all sides and angles are equal are called regular closed figures.
The first part of the chapter covers the following topics:
1. Perimeter of a rectangle = 2 × (length + breadth)
2. Perimeter of square = 4 × length of a side
3. Perimeter of an equilateral triangle = 3 × length of a side
The next part of the chapter emphasizes on the area.
The first method explained is the Calculation of area by counting squares.
To calculate the area of a figure using a squared paper, the following conventions are adopted:
(a) The area of one full square is taken as 1 sq unit. If it is a centimeter square sheet, then the area of one full square will be 1 sq cm.
(b) Ignore portions of the area that are less than half a square.
(c) If more than half a square is in a region. Count it as one square.
(d) If exactly half the square is counted, take its area as 1/2 sq units.
Another method is the direct formula-based method.
Area of a rectangle = length × breadth
Area of a square = side × side
Unsolved questions based on the above-cited topics.
Assessment of these concepts can be done by solving exercises 10.1, 10.2, and 10.3. Exercise 10.2 is a short exercise containing only one question.
Solved examples are covered in the chapter to make the students understand each topic in a crystal clear way.
Summarization of all important points is done at the end of the chapter- Mensuration.
Step by Step explanation:
p=2(l+b)
260=2(90+b)
130=90+b⇒b=40cm= breadth
A=hbb
2=60·60
2=1800
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